Browse > Article
http://dx.doi.org/10.6113/TKPE.2021.26.5.307

An Adaptive Digital Notch Filter for Stabilization of Single-Phase Grid-Connected Inverters With LCL Filter  

Heo, Jin-Yong (Dept. of Electrical Engineering, Pukyong Nat'l University)
Kim, Hak-Soo (Dept. of Electrical Engineering, Pukyong Nat'l University)
Nho, Eui-Cheol (Dept. of Electrical Engineering, Pukyong Nat'l University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.26, no.5, 2021 , pp. 307-314 More about this Journal
Abstract
Even though the LCL filters have superior harmonic attenuation ability to L filters, stability has always been an issue. The system could be unstable because of the resonance phenomenon, especially when digital controller is used. Adding a notch filter to the compensator is one approach to solve the problem. Resonance phenomenon can be inhibited by aligning notch frequency to system resonance frequency. However, resonance frequency variation can be obtained because the actual system has a nonstationary characteristic. Therefore, the system could be unstable, where the system parameters are changed when the conventional notch filter is used. An adaptive digital notch filter that stabilizes the system even system parameters are changed. Simulation and experiment results are provided to verify the validity of the proposed adaptive filter.
Keywords
Grid-connected inverter; LCL filter; Stabilization; Digital notch filter;
Citations & Related Records
연도 인용수 순위
  • Reference
1 C. Bao, X. Ruan, X. Wang, W. Li, D. Pan, and K. Weng, "Step-by-step controller design for LCL-type grid-connected inverter with capacitor-current-feedback active-damping," IEEE Transactions on Power Electronics, Vol. 29, No. 3, pp. 1239-1253, Mar. 2014.   DOI
2 W. Yao, Y. Yang, X. Zhang, and F. Blaabjerg, "Digital notch filter based active damping for LCL filters," in 2015 IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 2399-2406, 2015.
3 S. G. Parker, B. P. McGrath, and D. G. Holmes, "Regions of active damping control for LCL filters," IEEE Transactions on Industry Applications, Vol. 50, No. 1, pp. 424-432, Jan./Feb. 2014.   DOI
4 J. Wang, J. D. Yan, L. Jiang, and J. Zou, "Delay-dependent stability of single-loop controlled grid-connected inverters with LCL filters," IEEE Transactions on Power Electronics, Vol. 31, No. 1, pp. 743-757, Jan. 2016.   DOI
5 X. Wang, F. Blaabjerg, and P. C. Loh, "Virtual RC damping of LCL-filtered voltage source converters with extended selective harmonic compensation," IEEE Transactions on Power Electronics, Vol. 30, No. 9, pp. 4726-4737, Sep. 2015.   DOI
6 M. Liserre, F. Blaabjerg, and R. Teodorescu, "Grid impedance estimation via excitation of LCL-filter resonance," IEEE Transactions on Industry Applications, Vol. 43, No. 5, pp. 1401-1407, Sep./Oct. 2007.   DOI
7 R. Pena-Alzola, M. Liserre, F. Blaabjerg, M. Ordonez, and T. Kerekes, "A self-commissioning notch filter for active damping in a three-phase LCL-filter-based grid-tie converter," IEEE Transactions on Power Electronics, Vol. 29, No. 12, pp. 6754-6761, Dec. 2014.   DOI
8 Y. Jing, A. A. Durra, and E. F. El-Saadany, "An adaptive digital notch filter based on grid impedance estimation for improving LCL filter peformance," in 2018 IEEE/PES Transmission and Distribution Conference and Exposition, pp. 1-5, Apr. 2018.
9 H. T. Kim and S. S. Jhang, "Key technologies for stabilization of power system for successful achievement of 3020 renewable energy policy," The Transactions of the Korean Institute of Electrical Engineers, Vol. 67, No. 2, pp. 149-157, Feb. 2018.   DOI
10 R. Pena-Alzola, M. Liserre, F. Blaabjerg, R. Sebastian, J. Dannehl, and F. W. Fuchs, "Analysis of the passive damping losses in LCL-filter-based grid converters," IEEE Transactions on Power Electronics, Vol. 28, No. 6, pp. 2642-2646, Jun. 2013.   DOI
11 J. Dannehl, M. Liserre, and F. W. Fuchs, "Filter-based active damping of voltage source converters with LCL filter," IEEE Transactions on Industrial Electronics, Vol. 58, No. 8, pp. 3623-3633, Aug. 2011.   DOI